JOE BREEZE stares blankly at the freshman girl for a moment, then looks down at the mountain bike she’s handed him. Breeze, 60, is best known for creating the first purpose-made mountain bikes back in the 1970s, when he and other founders of the sport began riding the dirt trails around Marin County, California. He still develops new bikes for his Breezer brand, which sells 55 different models in 16 countries around the world. He’s also the volunteer race-day mechanic for Sir Francis Drake High School’s mountain-bike team, the Pirates.